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题目(2013年全国高考理综新课标卷Ⅰ第25题)如图1,两条平行导轨所在平面与水平地面的夹角为θ,间距为L。导轨上端接有一平行板电容器,电容为C。导轨处于匀强磁场中,磁感应强度大小为B,方向垂直于导轨平面。在导轨上放置一质量为m的金属棒,棒可沿导轨下滑,且在下滑过程中保持与导轨垂直并良好接触。已知金属棒与导轨之间的动摩擦因数为μ,重力加速度大小为g。忽略所有电阻。
Question (2013 National Undergraduate Science and Technology New Curriculum Volume I Question 25) Figure 1, the two parallel rails where the angle between the plane and the horizontal ground θ, spacing L. The upper end of the rail has a parallel plate capacitor with a capacitance of C. Rail in a uniform magnetic field, the size of the magnetic flux density B, the direction perpendicular to the plane guide. Place a metal bar of mass m on the rail, the bar glides along the rail, and remains perpendicular and in good contact with the rail during glide. It is known that the dynamic friction coefficient between the metal rod and the guide rail is μ and the magnitude of the gravitational acceleration is g. Ignore all resistors.